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kvmclock: guest stop notification

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Often when a guest is stopped from the qemu console, it will report spurious
soft lockup warnings on resume.  There are kernel patches being discussed that
will give the host the ability to tell the guest that it is being stopped and
should ignore the soft lockup warning that generates.  This patch uses the qemu
Notifier system to tell the guest it is about to be stopped.

Signed-off-by: Eric B Munson <emunson@mgebm.net>
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Eric B Munson 2012-04-07 06:17:47 +05:30 committed by Marcelo Tosatti
parent 9ab2195dcb
commit f349c12c04
1 changed files with 16 additions and 0 deletions
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16
hw/kvm/clock.c
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@ -65,9 +65,25 @@ static void kvmclock_vm_state_change(void *opaque, int running,
RunState state)
{
KVMClockState *s = opaque;
CPUArchState *penv = first_cpu;
int cap_clock_ctrl = kvm_check_extension(kvm_state, KVM_CAP_KVMCLOCK_CTRL);
int ret;
if (running) {
s->clock_valid = false;
if (!cap_clock_ctrl) {
return;
}
for (penv = first_cpu; penv != NULL; penv = penv->next_cpu) {
ret = kvm_vcpu_ioctl(penv, KVM_KVMCLOCK_CTRL, 0);
if (ret) {
if (ret != -EINVAL) {
fprintf(stderr, "%s: %s\n", __func__, strerror(-ret));
}
return;
}
}
}
}